A121683 Untouchable cubes.

216, 1728, 5832, 8000, 13824, 21952, 27000, 74088, 110592, 157464, 175616, 195112, 216000, 238328, 287496, 314432, 343000, 373248, 729000, 884736, 941192, 1061208, 1124864, 1259712, 1481544, 1728000, 2000376, 2097152, 2628072, 2744000, 2985984, 3241792, 3511808

Offset: 1

Author

Klaus Brockhaus, Aug 15 2006

Keywords

• nonn

Comments

Untouchable numbers (cf. A005114) that are third powers (cf. A000578); a(1) to a(7) are the third powers of 6, 12, 18, 20, 24, 28, 30.

Examples

			216 = 6^3 = A000578(6) = A005114(13).
		

Links

• Amiram Eldar, Table of n, a(n) for n = 1..45

Crossrefs

Intersection of A000578 and A005114.

Cf. A111278 (untouchable squares).

Extensions

a(8)-a(30) from Donovan Johnson, Jul 19 2008

Terms a(26)-a(30) corrected and a(31)-a(33) added by Amiram Eldar, Sep 23 2022